1969 Cuda Wiper Motor Connections for aftermarket motor

I think that the actual plug is the same since it is part of the main underdash harness (actually 2 separate but interlocking plugs), but the wires are set up different. The wiper wire is separate still with its own switch plug and all that is separate from the main wiring harness. In particular the low speed on the 2 speed is accomplished with that separate external resistor. I have no clue how the 2 speed motor would react to input from the variable speed rheostat or the 3rd speed setting in the switch, but it can't be good.